제출 #1257436

#제출 시각아이디문제언어결과실행 시간메모리
1257436dhananStar triangles (IZhO11_triangle)C++20
100 / 100
473 ms9216 KiB
#include <bits/stdc++.h> using namespace std; using ll = long long; int main(){ ll N; cin >> N; vector<ll> x(N + 1), y(N + 1); map<ll, ll> barista, kolombus; ll ans = 0; for(int i = 1; i <= N; i++){ cin >> x[i] >> y[i]; barista[x[i]]++; kolombus[y[i]]++; } for(int i = 1; i <= N; i++){ ll ans_x = barista[x[i]]-1; ll ans_y = kolombus[y[i]]-1; ans += ans_x * ans_y; } cout << ans; }
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